% Local diagrams use the port order NW, NE, SE, SW.  The NW--SE
% strand is the undercrossing in K_2 and L'_2.
\providecommand{\webKzero}{%
  \draw (-.707107,.707107) .. controls (-.43,.32) and (-.22,.32) .. (0,.32)
        .. controls (.22,.32) and (.43,.32) .. (.707107,.707107);
  \draw (-.707107,-.707107) .. controls (-.43,-.32) and (-.22,-.32) .. (0,-.32)
        .. controls (.22,-.32) and (.43,-.32) .. (.707107,-.707107);}
\providecommand{\webKone}{\begin{scope}[rotate=90]\webKzero\end{scope}}
\providecommand{\webKtwo}{%
  \draw (-.707107,.707107)--(-.11,.11);
  \draw (.11,-.11)--(.707107,-.707107);
  \draw (-.707107,-.707107)--(.707107,.707107);}
\providecommand{\webLzero}{%
  \webKzero\draw (0,.32)--(0,-.32);
  \fill (0,.32) circle (1.25pt);\fill (0,-.32) circle (1.25pt);}
\providecommand{\webLone}{\begin{scope}[rotate=90]\webLzero\end{scope}}
\providecommand{\webLtwoprime}{%
  \webKtwo\draw (-.38,-.38)--(.38,-.38);
  \fill (-.38,-.38) circle (1.25pt);\fill (.38,-.38) circle (1.25pt);}